Safety device for steam-boilers.



v No 893 02s. PATENTEYD JULY 14, 1908. a J. B. SMITH. SAFETY DEVICE FOR STEAMIBOILERS. I

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APPLICATION II'LED AUG. 16; 1907.

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To'all whom Be a known'that 1, JAME E. SMITH; we-

I Zen of the-United States,residing at El-Paso,

.. vice for Steam-Boilers, of which .in'the boiler.

\ The object ofthe present invention isto provide an attachment ofthis character that e shall be simple of;.constructiomefficient and durable in use-and in which the sounding of afalse alarm wil-l bepositively prevented and the replacing ot thexneltedfuse be rendered 1n'1poss1bl-without the knowledge of the -.chief engineer orniastermechanic, so that a careless engineer may-be readily detected.

Furthermore, to provide an attachment combining the abovecharacteristics and'the added one of belnguadaptedto operate before the water drops as'dow as the crown sheet,

whereby to )rot'cct the latter from damage,

guide 1, the innerend ed in m-cordar'irc Witlr'thc and also to a lowtheengi-neertirhe to supply water to the boiler or tojdumjp his fires.

With the above and )ther objects inview, as will appear-as the natureof the invention is better understood, the same consists in the novel construction and combination of parts of a safety dcvicel'orstoamboilcrs as-wnlbe hereinafter fully described and claimed.

[n the accompanying drawings "forming a part of this spccificati'on and in Whichllke characters of reference indicate corresponding p:tItS,--l*lglll'0l is aviewkin vertical I011? gitudinalscctionofasatety Fig. 2 is a horizo'nta see Lona vieiw 'taken on the line 22 ol' "Fig. '3 is a, Sll-llj-llitl" view taken olrthcflinch-+3.

'lhc device:compriseaa hr into the boilcrshell ver the crowmshectO and the outor-endlo whid s reduced to pro vide a gland box-2hr which ishou sed anordinary packing gland 3. The exte-nsionof the box. 2 is thrcade'deto. receive a la'ndlnutf/l which as usual',bcars upoiv he gl andand-oi crates to force the latter into engagement with a packing (notshown)contained in a packing space 5. The body 1 is provided we names FOB mumm es.

Specification 0! Least- Patent. I I Patented July 14, 1908. 'APP M mm mm i-.1 m in. 588,839. I

with a threadedorifice that extends rrom a point-adjacent to the space 5' to apoint near its inner end, and engaging the-orifice is a threaded intermediate -ortir'm 6 of the valve stein 7, the outer end 0 which carries ahan'd wheel 8 held in place by a lock nut"). The

inner end of the stemisprovided with a head 1Q thatis arranged to fit within the combined valve and cup nut 1 1 that is interiorly thread-- ed and engages the outer threadedjend 12' of a fuse block valve stem '13. The connection between 'the valve stein 7 and valve stem13 is of a swiveled character whereby to permit the former stem to turn without imparting motion to the latter. valvell is'rounded, and fits into a similarly shaped seat 14 formed in the end of the body.

In; order to hold the stem 13 from turning when the stem 7 is rotated, the former is pro- "10 The 'outerface ofthe vided with a polygonal head 15 that works has a threaded en age nent with the inner end of the bod That portion of the guide 17 in which are inner end of the stein 13 end of the stem 1-3, which is made-from a non-corrosive metal, is co'noidal and constittutes gh valve 18, tl-1e'function of which will presently 'ap ear.

Thti fuse p ug to which reference has been i in a similarly shaped-bore lfi'formed in a' "valve stern guide 17, the outer end of which works is circular in cross sectionand is of a diameter snugly to fit the stem." The inner made comprises an inverted cup-sha ed nip-- ple 19 of iron or steel having a threac ed connection with the 'crownrsheet C of the/boiler and is provided with a peripheral flangeZO' formed with wrench faces, a thir'rible 21 threaded into. the nipple and having wrench faces 22, and an inverted truncated coneshaped fuse plug 23 of Ba'nca tin,-olr of afu's ble-allo Itwiil be noted e nipple projects some we is ent r ly otithecrown sheet,th rebyrmtueniym ob reference to Fig. lithat the outer. end of distance beyond the crown sheet, the obgect' of this arrangement hein t operlni'tthe use plug to blow out beforetl tect the sheet from injiiirybut also test word the on jdished portion of the iii 'f l'e serves; to revent the fla nos from str mg the fuse p fug,

therebgqcaus'mg the latter :to i'n'aintain' a umfornrteinperature.

In order to.prevent the renewal of the'fu'se plug without the knowledge of the chief eng'ineer, and to afford a ready means of detecting a careless firemanor engineer, a seal wire 24 is provided which is threaded through openings in lugs and" 26carried respecthe ends of the wire being twisted together and secured by lead or other metallic seal27.

The die for the seal will be retained by the chiefengineer so that ii a plug is'bl'own out s the person in authority wil have ocular proot byZ-the disrupting of the wire that a hose bloclr has been replaced and will be enabled to trace the person responsible for the accident. i Qombined with. the outer portion of the body is a ,whistle 28 that communicates with a passageway 29 which extends to the valve seat 14 and through which steam is supplied to sound the whistle. This steam is supplied to the-passageway through ports 30 and 31 in the inner walls ofthe guide 17 and through ports 32 arranged between the outer ends of the guide 17 and the inner end of the body.

The operation of the device is as follows: 25 As soon as the water in the boiler lowers suti'iciently to expose the upper end of the fuse plug the latter will melt and blow out and es-' coping steam will notify the engineer of the accident in time tosup ly water to the'boiler an or to dump hisjlires.

. occurs the hand wheel 8 is turned thereby breahingthe wire and as the valve stem de sconds the valve 11 clears the passageway 29,whereupon /the steam willrnsh .throu h ,3 and-32, thence through the ,ine. -h1se plug' isreplaced, which, of eourse nanflouly h done after the furnace have become-e inguished.

4e The valve 18 vdienseated in the thimble 21 will prevent 'thezescape/of steam and water from boiler to the fire box until the plug hee-n replaced,

defined are simp v thorou hlylefiicient for the purpose designed 5 tivcly by the hand wheel and by the body 1,

'seated,'to permit the escape of steam for the s soon as the accident andeause the whistle to sound.

It will be seen from the foregoing description that although the improvements herein e in character they will be and wil in apositive manner secure the objects sought,

'What is claimed is 1. The combination with a body, of a valve'stem guide secured thereto and provided with ports, a fuse plug valve mounted within the guide and held against rotary movement relatively thereto, avalve stem 65 having a swivel connection with the fuse plug valve, and a combined valve and. nut for connecting the {use plug, valve and the valve stem and operating, when the plug valve is purpose of sounding an alarm.

2. The combination with ajbody provided with a passageway, and a whistle communicating with one end ofv the passageway, of a valve stem ide secured to the body and provided-wit ports normally out of communication with the passa eway, a fuse' )lu valve mounted within t e guide and el against rotary movement relatively thereto, a valve stem, a combined valve and nutconnecting the valve stem and the fuse plug valve and arranged to permit the stem to have rotary movements independently of the fuse plug valve, the combined valve and nut operating normally to close the passageway leadin to the whistle, and a fuse plug arrange in the path of movement of the fuse plug valve.

In testimony that I claim the foregoing as my own, I havevhereto aflixediny signature 30 in the presence of two witnesses.

4 JAS. E. SMITH. Witnesses:

JAMES CASEY,

JUAN Fnauoo. 

